日期：2016-5-20（原创文章,禁止转载）
TI（NS） LM3448 TRIAC调光离线LED驱动解决方案 - 消费电ふ - 电ふ工程网
Standard VCC start-up with auxiliary winding bias circuit for improved system efficiency,
VCC derived COFF current source
,Additional TRIAC holding current circuit for improved dimmer performance at low conduction angles,
Output overvoltage protection (OVP).
LM3448 A19 Edison改进型评估板
This demonstration board highlights the performance of a LM3448 non-isolated LED driver solution that can be used to power a single LED string consisting of eight to twelve series connected LEDs from a 85VRMS to 135VRMS, 60 Hz input power supply.
This is a two-layer board using the bottom and top layer for component placement
. The demonstration board can be modified to adjust the LED forward current, the number of series connected LEDs that are driven and the switching frequency. The topology used for this evaluation board eliminates the need for passive power factor correction and results in high power factor with minimal component count which results in a size that can fit in a standard A19 Edison socket. This board will also operate correctly and dim smoothly using most standard TRIAC dimmers.Refer to the LM3448 datasheet for detailed information regarding the LM3448 device
. A schematic and layout have also been included along with measured performance characteristics. A bill of materials is also included that describes the parts used on this demonstration board.南宁癫痫专科医院天津哪家癫痫医院有好的治疗效哪些危害主要是由癫痫引起的癫痫患者如何检查
